iankelling.org Git - distro-setup/blob - mail-setup

   1 #!/bin/bash -l
   2 # Copyright (C) 2016 Ian Kelling
   3
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15
  16 set -eE -o pipefail
  17 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
  18
  19 ####### begin perstent password instructions ######
  20 # # exim passwords:
  21 # # for hosts which have all private files I just use the same user
  22 # # for other hosts, each one get\'s their own password.
  23 # # for generating secure pass, and storing for server too:
  24 # # user=USUALLY_SAME_AS_HOSTNAME
  25 # user=li
  26 # f=$(mktemp)
  27 # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
  28 # s sed -i "/^$user:/d" /p/c/filesystem/etc/exim4/passwd
  29 # echo "$user:$(mkpasswd -m sha-512 -s <$f)" >>/p/c/filesystem/etc/exim4/passwd
  30 # echo "mail.iankelling.org:$user:$(<$f)" >> /p/c/machine_specific/$user/filesystem/etc/mailpass
  31 # # then run this script, or part of it which uses /etc/mailpass
  32
  33 # # dovecot password, i just need 1 as I\'m the only user
  34 # mkdir /p/c/filesystem/etc/dovecot
  35 # echo "ian:$(doveadm pw -s ssha256)::::::" >/p/c/filesystem/etc/dovecot/users
  36 # conflink
  37
  38
  39
  40 # # for ad-hoc testing of some random new host sending mail:
  41 # user=li # client host username & hostname
  42 # f=$(mktemp)
  43 # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
  44 # s sed -i "/^$user:/d" /etc/exim4/passwd
  45 # echo "$user:$(mkpasswd -m sha-512 -s <$f)" | s tee -a /etc/exim4/passwd
  46 # echo "mail.iankelling.org:$user:$(<$f)" | ssh root@$user dd of=/etc/exim4/passwd.client
  47 ####### end perstent password instructions ######
  48
  49
  50 ####### begin persistent dkim/dns instructions #########
  51 # # Remove 1 level of comments in this section, set the domain var
  52 # # for the domain you are setting up, then run this and copy dns settings
  53 # # into dns.
  54 # domain=iankelling.org
  55 # c /p/c/filesystem/etc/exim4
  56 # # this has several bugs addressed in comments, but it was helpful
  57 # # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
  58
  59 # openssl genrsa -out $domain-private.pem 2048 -outform PEM
  60 # openssl rsa -in $domain-private.pem -out $domain.pem -pubout -outform PEM
  61 # # selector is needed for having multiple keys for one domain.
  62 # # I dun do that, so just use a static one: li
  63 # echo "txt record name: li._domainkey.$domain"
  64 # # Debadmin page does not have v=, fastmail does, and this
  65 # # says it\'s recommended in 3.6.1, default is DKIM1 anyways.
  66 # # https://www.ietf.org/rfc/rfc6376.txt
  67 # # Join and print all but first and last line.
  68 # # last line: swap hold & pattern, remove newlines, print.
  69 # # lines 2+: append to hold space
  70 # echo "txt record contents:"
  71 # echo "v=DKIM1; k=rsa; p=$(sed -n '${x;s/\n//gp};2,$H' $domain.pem)"
  72 # chmod 644 $domain.pem
  73 # chmod 640 $domain-private.pem
  74 # # in conflink, we chown these to group debian
  75 # conflink
  76 # # selector was also put into /etc/exim4/conf.d/main/000_localmacros,
  77 # # via the mail-setup scripts
  78
  79 # # 2017-02 dmarc policies:
  80 # # yahoo: p=reject, hotmail: p=none, gmail: p=none, fastmail none for legacy reasons
  81 # # gmail will be changing to p=reject, which is expected to cause problems
  82 # # with a few old mailing lists, copying theirs for now.
  83 # echo "dmarc dns, name: _dmarc value: v=DMARC1; p=none; rua=mailto:mailauth-reports@$domain"
  84
  85 # # 2017-02 spf policies:
  86 # # google ~all, hotmail -all, yahoo: ?all, fastmail ?all
  87 # # i include fastmail\'s settings, per their instructions,
  88 # # and follow their policy. In mail in a box, or similar instructions,
  89 # # I\'ve seen recommended to not use a restrictive policy.
  90 # echo "spf dns: name is empty, value: v=spf1 a include:spf.messagingengine.com ?all"
  91
  92 # # to check if dns has updated, you do
  93 # host -a mesmtp._domainkey.$domain
  94
  95 # # mx records,
  96 # # setting it to iankelling.org would work the same, but this
  97 # # is more flexible, I could change where mail.iankelling.org pointed.
  98 # cat <<'EOF'
  99 # mx records, 2 records each, for * and empty domain
 100 # pri 10 mail.iankelling.org
 101 # pri 20 in1-smtp.messagingengine.com
 102 # pri 30 in2-smtp.messagingengine.com
 103 # EOF
 104 ####### end  persistent dkim instructions #########
 105
 106
 107 # misc exim notes:
 108 # useful exim docs:
 109 # /usr/share/doc/exim4-base/README.Debian.gz
 110 # /usr/share/doc/exim4-base/spec.txt.gz
 111
 112 # routers, transports, and authenticators are sections, and you define
 113 # driver instances in those sections, and the manual calls them driver
 114 # types but there is also a more specific "type" of driver, which is specified
 115 # with the driver = some_module setting in the driver.
 116
 117 # the driver option must precede and private options (options that are
 118 # specific to that driver), so follow example of putting it at beginning.
 119
 120 # The full list of option settings for any particular driver instance,
 121 # including all the defaulted values, can be extracted by making use of
 122 # the -bP command line option.
 123
 124 # exim clear out message queue. as root:
 125 # adapted from somewhere on stackoverflow.
 126 # ser stop exim4; sleep 1; exim -bp | exiqgrep -i | xargs exim -Mrm; ser start exim4
 127
 128 # fastmail has changed their smtp server, but the old one still works,
 129 # I see no reason to bother changing.
 130 # New one is smtp.fastmail.com
 131
 132 # test delivery & rewrite settings:
 133 #exim4 -bt ian@localhost
 134
 135
 136 type=$1
 137 postfix() { [[ $type == postfix ]]; }
 138 exim() { [[ $type == exim4 ]]; }
 139 if ! exim && ! postfix; then
 140     echo "$1: error: expected exim4 or postfix as first arg"
 141     exit 1
 142 fi
 143
 144
 145 local_mx=mail.iankelling.org
 146
 147 host=$local_mx
 148 relayhost="[$host]:25" # postfix
 149 smarthost="$host::25" # exim
 150
 151
 152 # this was for when I used the exim config type
 153 # "mail sent by smarthost; received via SMTP or fetchmail"
 154 # if [[ $HOSTNAME == $MAIL_HOST ]]; then
 155 #     host=mail.messagingengine.com
 156 #     relayhost="[$host]:587" # postfix
 157 #     smarthost="$host::587" # exim
 158 # fi
 159
 160 forward=ian@$local_mx
 161
 162
 163 if [[ $HOSTNAME == $MAIL_HOST ]]; then
 164     # if we are MAIL_HOST, exim config sets up an /etc/alias from
 165     # root to the postmaster, which i config to ian, as long as there
 166     # exists an entry for root, or there was no preexisting aliases file.
 167     # based on the postinst file.
 168     s rm -f /etc/aliases
 169 else
 170     # linode image has a root alias, I think it might override our .forward
 171     sudo sed -i '/^root:/d' /etc/aliases
 172     s newaliases
 173
 174     # background: This also works instead of ~/.forward
 175     # s sed -i --follow-symlinks '/^root/d' /etc/aliases ||:
 176     #echo "root: $HOSTNAME@$SOME_DOMAIN" | s tee -a /etc/aliases
 177     # this can\'t be a symlink and has permission restrictions
 178     # it might work in /etc/aliases, but this seems more proper.
 179     e $forward > ~/.forward
 180     e $forward | s tee /root/.forward
 181     # 644 is required. shouldn\'t need changing, but set it just in case.
 182     s chmod 644 ~/.forward /root/.forward
 183 fi
 184
 185 # offlineimap uses this too, it is much easier to use one location than to
 186 # condition it\'s config and postfix\'s config
 187 case $distro in
 188     fedora) s lnf -T ca-certificates.crt /etc/ssl/ca-bundle.trust.crt ;;
 189     *) :
 190 esac
 191
 192 if postfix; then
 193     # dunno why, but debian installed postfix with builddep emacs
 194     # but I will just explicitly install it here since
 195     # I use it for sending mail in emacs.
 196     if isdeb; then
 197         s debconf-set-selections <<EOF
 198 postfix postfix/main_mailer_type select Satellite system
 199 postfix postfix/mailname string $HOSTNAME
 200 postfix postfix/relayhost string $relayhost
 201 EOF
 202
 203         pi postfix
 204     else
 205         pi postfix
 206         # Settings from reading the output when installing on debian,
 207         # then seeing which were different in a default install on arch.
 208         # I assume the same works for fedora.
 209         postconfin <<EOF
 210 mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
 211 mailbox_size_limit = 0
 212 relayhost = $relayhost
 213 inet_interfaces = loopback-only
 214 EOF
 215
 216         s systemctl enable postfix
 217         s systemctl start postfix
 218     fi
 219     # i\'m assuming mail just won\'t work on systems without the sasl_passwd.
 220     postconfin <<'EOF'
 221 smtp_sasl_auth_enable = yes
 222 smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
 223 smtp_sasl_security_options = noanonymous
 224 smtp_tls_security_level = secure
 225 message_size_limit =  20480000
 226 smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
 227 inet_protocols = ipv4
 228 EOF
 229     # msg_size_limit: I ran into a log file not sending cuz of size. double from 10 to 20 meg limit
 230     # inet_protocols: without this, postfix tries an ipv6 lookup then gives
 231     # up and fails. snippet from syslog: type=AAAA: Host not found, try again
 232
 233
 234     f=/etc/postfix/sasl_passwd
 235     s rm -f $f
 236     s touch $f
 237     s chmod 600 $f
 238     s cat /etc/mailpass| while read -r domain port pass; do
 239         # format: domain port user:pass
 240         # mailpass is just a name i made up, since postfix and
 241         # exim both use a slightly crazy format to translate to
 242         # each other, it\'s easier to use my own format.
 243         printf "[%s]:%s %s" "$domain" "$port" "${pass/@/#}" | s tee -a $f >/dev/null
 244     done
 245     s postmap hash:/etc/postfix/sasl_passwd
 246     s service postfix reload
 247
 248 else # exim. has debian specific stuff for now
 249
 250
 251     # wording of question from dpkg-reconfigure exim4-config
 252     # 1. internet site; mail is sent and received directly using SMTP
 253     # 2. mail sent by smarthost; received via SMTP or fetchmail
 254     # 3. mail sent by smarthost; no local mail
 255     # 4. local delivery only; not on a network
 256     # 5. no configuration at this time
 257     #
 258     # Note, I have used option 2 in the past for receiving mail
 259     # from lan hosts, sending external mail via another smtp server.
 260     #
 261     # Note, other than configtype, we could set all the options in
 262     # both types of configs without harm, they would either be
 263     # ignored or be disabled by other settings, but the default
 264     # local_interfaces definitely makes things more secure.
 265
 266     # most of these settings get translated into settings
 267     # in /etc/exim4/update-exim4.conf.conf
 268     # mailname setting sets /etc/mailname
 269
 270     s debconf-set-selections <<EOF
 271 exim4-config exim4/use_split_config boolean true
 272 EOF
 273
 274     source /a/bin/bash_unpublished/source-semi-priv
 275     exim_main_dir=/etc/exim4/conf.d/main
 276     s mkdir -p exim_main_dir
 277     if [[ $HOSTNAME == $MAIL_HOST ]]; then
 278         # afaik, these will get ignored, routing to my own machine, but rm
 279         # them to make me feel better.
 280         s rm -f ~/.forward /root/.forward
 281
 282         s debconf-set-selections <<EOF
 283 # Mail Server configuration
 284 # -------------------------
 285
 286 # Please select the mail server configuration type that best meets your needs.
 287
 288 # Systems with dynamic IP addresses, including dialup systems, should generally be
 289 # configured to send outgoing mail to another machine, called a 'smarthost' for
 290 # delivery because many receiving systems on the Internet block incoming mail from
 291 # dynamic IP addresses as spam protection.
 292
 293 # A system with a dynamic IP address can receive its own mail, or local delivery can be
 294 # disabled entirely (except mail for root and postmaster).
 295
 296 #   1. internet site; mail is sent and received directly using SMTP
 297 #   2. mail sent by smarthost; received via SMTP or fetchmail
 298 #   3. mail sent by smarthost; no local mail
 299 #   4. local delivery only; not on a network
 300 #   5. no configuration at this time
 301
 302 # General type of mail configuration: 1
 303 exim4-config exim4/dc_eximconfig_configtype select internet site; mail is sent and received directly using SMTP
 304
 305
 306
 307 # The 'mail name' is the domain name used to 'qualify' mail addresses without a domain
 308 # name.
 309
 310 # This name will also be used by other programs. It should be the single, fully
 311 # qualified domain name (FQDN).
 312
 313 # Thus, if a mail address on the local host is foo@example.org, the correct value for
 314 # this option would be example.org.
 315
 316 # This name won\'t appear on From: lines of outgoing messages if rewriting is enabled.
 317
 318 # System mail name:
 319 exim4-config exim4/mailname string li.iankelling.org
 320
 321
 322
 323
 324 # Please enter a semicolon-separated list of recipient domains for which this machine
 325 # should consider itself the final destination. These domains are commonly called
 326 # 'local domains'. The local hostname (treetowl.lan) and 'localhost' are always added
 327 # to the list given here.
 328
 329 # By default all local domains will be treated identically. If both a.example and
 330 # b.example are local domains, acc@a.example and acc@b.example will be delivered to the
 331 # same final destination. If different domain names should be treated differently, it
 332 # is necessary to edit the config files afterwards.
 333
 334 # Other destinations for which mail is accepted:
 335 # iank.bid is for testing
 336 # mail.iankelling.org is for machines i own
 337 exim4-config exim4/dc_other_hostnames string *.iankelling.org;iankelling.org;*iank.bid;iank.bid;*zroe.org;zroe.org
 338
 339
 340
 341
 342 # Please enter a semicolon-separated list of IP addresses. The Exim SMTP listener
 343 # daemon will listen on all IP addresses listed here.
 344
 345 # An empty value will cause Exim to listen for connections on all available network
 346 # interfaces.
 347
 348 # If this system only receives mail directly from local services (and not from other
 349 # hosts), it is suggested to prohibit external connections to the local Exim daemon.
 350 # Such services include e-mail programs (MUAs) which talk to localhost only as well as
 351 # fetchmail. External connections are impossible when 127.0.0.1 is entered here, as
 352 # this will disable listening on public network interfaces.
 353
 354 # IP-addresses to listen on for incoming SMTP connections:
 355 exim4-config exim4/dc_local_interfaces  string
 356
 357
 358
 359
 360 # Mail for the 'postmaster', 'root', and other system accounts needs to be redirected
 361 # to the user account of the actual system administrator.
 362
 363 # If this value is left empty, such mail will be saved in /var/mail/mail, which is not
 364 # recommended.
 365
 366 # Note that postmaster\'s mail should be read on the system to which it is directed,
 367 # rather than being forwarded elsewhere, so (at least one of) the users listed here
 368 # should not redirect their mail off this machine. A 'real-' prefix can be used to
 369 # force local delivery.
 370
 371 # Multiple user names need to be separated by spaces.
 372
 373 # Root and postmaster mail recipient:
 374 exim4-config exim4/dc_postmaster string ian
 375
 376
 377
 378 # Exim is able to store locally delivered email in different formats. The most commonly
 379 # used ones are mbox and Maildir. mbox uses a single file for the complete mail folder
 380 # stored in /var/mail/. With Maildir format every single message is stored in a
 381 # separate file in ~/Maildir/.
 382
 383 # Please note that most mail tools in Debian expect the local delivery method to be
 384 # mbox in their default.
 385
 386 #   1. mbox format in /var/mail/  2. Maildir format in home directory
 387
 388 # Delivery method for local mail: 2
 389 exim4-config exim4/dc_localdelivery select Maildir format in home directory
 390 EOF
 391         # MAIN_HARDCODE_PRIMARY_HOSTNAME might mess up the
 392         # smarthost config type, not sure. all other settings
 393         # would be unused in that config type.
 394         s dd of=$exim_main_dir/000_localmacros 2>/dev/null <<'EOF'
 395 MAIN_TLS_ENABLE = true
 396
 397 DKIM_CANON = relaxed
 398 DKIM_SELECTOR = li
 399
 400 # from comments in
 401 # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
 402
 403 # The file is based on the outgoing domain-name in the from-header.
 404 DKIM_DOMAIN = ${lc:${domain:$h_from:}}
 405 # sign if key exists
 406 DKIM_PRIVATE_KEY= ${if exists{/etc/exim4/${dkim_domain}-private.pem} {/etc/exim4/${dkim_domain}-private.pem}}
 407
 408
 409 # failing message on mail-tester.com:
 410 # We check if there is a server (A Record) behind your hostname treetowl.
 411 # You may want to publish a DNS record (A type) for the hostname treetowl or use a different hostname in your mail software
 412 # https://serverfault.com/questions/46545/how-do-i-change-exim4s-primary-hostname-on-a-debian-box
 413 # and this one seemed appropriate from grepping config
 414 MAIN_HARDCODE_PRIMARY_HOSTNAME = li.iankelling.org
 415
 416 # normally empty, I set this so I can set the envelope address
 417 # when doing mail redelivery to invoke filters
 418 MAIN_TRUSTED_GROUPS = ian
 419
 420 LOCAL_DELIVERY = dovecot_lmtp
 421
 422 CHECK_RCPT_LOCAL_ACL_FILE = /etc/exim4/rcpt_local_acl
 423 EOF
 424
 425
 426         s dd of=/etc/systemd/system/offlineimapsync.timer <<'EOF'
 427 [Unit]
 428 Description=Run offlineimap-sync once every 5 mins
 429
 430 [Timer]
 431 OnCalendar=*:0/5
 432
 433 [Install]
 434 WantedBy=timers.target
 435 EOF
 436
 437         s dd of=/etc/systemd/system/offlineimapsync.service <<'EOF'
 438 [Unit]
 439 Description=Offlineimap sync
 440 After=multi-user.target
 441
 442 [Service]
 443 User=ian
 444 Type=oneshot
 445 ExecStart=/a/bin/log-quiet/sysd-mail-once offlineimap-sync /a/bin/distro-setup/offlineimap-sync
 446 EOF
 447         s systemctl daemon-reload
 448         s systemctl enable offlineimapsync.timer
 449         s systemctl start offlineimapsync.timer
 450
 451     else # $HOSTNAME != $MAIL_HOST
 452         s systemctl disable offlineimapsync.timer &>/dev/null ||:
 453         s systemctl stop offlineimapsync.timer &>/dev/null ||:
 454         #
 455         #
 456         # would only exist because I wrote it i the previous condition,
 457         # it\'s not part of exim
 458         s rm -f $exim_main_dir/000_localmacros
 459         s debconf-set-selections <<EOF
 460 exim4-config exim4/dc_eximconfig_configtype select mail sent by smarthost; no local mail
 461 exim4-config exim4/dc_smarthost string $smarthost
 462 EOF
 463     fi
 464
 465     # if we already have it installed, need to reconfigure, without being prompted
 466     if dpkg -s exim4-config &>/dev/null; then
 467         # gotta remove this, otherwise the set-selections are completely
 468         # ignored. It woulda been nice if this was documented somewhere!
 469         s rm -f /etc/exim4/update-exim4.conf.conf
 470         s dpkg-reconfigure -u -fnoninteractive exim4-config
 471     fi
 472     # light version does not have sasl auth support.
 473     pi exim4-daemon-heavy spamassassin
 474
 475     ##### begin spamassassin config
 476     ser enable spamassassin
 477     # per readme.debian
 478     s sed -i '/^\s*CRON\s*=/d' /etc/default/spamassassin
 479     s tee -a /etc/default/spamassassin <<<CRON=1
 480     # just noticed this in the config file, seems like a good idea.
 481     s sed -i '/^\s*NICE\s*=/d' /etc/default/spamassassin
 482     s tee -a /etc/default/spamassassin <<<'NICE="--nicelevel 15"'
 483     ser reload spamassassin
 484
 485     s dd of=/etc/systemd/system/spamddnsfix.service <<'EOF'
 486 [Unit]
 487 Description=spamd dns bug fix cronjob
 488
 489 [Service]
 490 Type=oneshot
 491 ExecStart=/a/bin/distro-setup/spamd-dns-fix
 492 EOF
 493     s dd of=/etc/systemd/system/spamddnsfix.timer <<'EOF'
 494 [Unit]
 495 Description=run spamd bug fix script every 10 minutes
 496
 497 [Timer]
 498 OnActiveSec=60
 499 # the script looks back 9 minutes into the journal,
 500 # it takes a second to run,
 501 # so lets run every 9 minutes and 10 seconds.
 502 OnUnitActiveSec=550
 503
 504 [Install]
 505 WantedBy=timers.target
 506 EOF
 507     ser daemon-reload
 508     sgo spamddnsfix.timer
 509     #
 510     #####   end spamassassin config
 511
 512     gitslink # needed to install the execstart files below
 513     s dd of=/etc/systemd/system/mailcert.service <<'EOF'
 514 [Unit]
 515 Description=Mail cert rsync
 516 After=multi-user.target
 517
 518 [Service]
 519 Type=oneshot
 520 ExecStart=/usr/local/bin/sysd-mail-once mailcert /usr/local/bin/mail-cert-cron
 521 EOF
 522
 523     s dd of=/etc/systemd/system/mailcert.timer <<'EOF'
 524 [Unit]
 525 Description=Run mail-cert once a day
 526
 527 [Timer]
 528 OnCalendar=daily
 529
 530 [Install]
 531 WantedBy=timers.target
 532 EOF
 533     ser daemon-reload
 534     ser start mailcert
 535     sgo mailcert.timer
 536
 537
 538     # based on a little google and package search, just the dovecot
 539     # packages we need instead of dovecot-common.
 540     #
 541     # dovecot-lmtpd is for exim to deliver to dovecot instead of maildir
 542     # directly.  The reason to do this is to use dovecot\'s sieve, which
 543     # has extensions that allow it to be almost equivalent to exim\'s
 544     # filter capabilities, some ways probably better, some worse, and
 545     # sieve has the benefit of being supported in postfix and
 546     # proprietary/weird environments, so there is more examples on the
 547     # internet. I was torn about whether to do this or not, meh.
 548     pi dovecot-core dovecot-imapd dovecot-sieve dovecot-lmtpd
 549
 550     # if we changed 90-sieve.conf and removed the active part of the
 551     # sieve option, we wouldn\'t need this, but I\'d rather not modify a
 552     # default config if not needed. This won\'t work as a symlink in /a/c
 553     # unfortunately.
 554     lnf -T sieve/main.sieve ~/.dovecot.sieve
 555
 556     # we have a few config files which installing exim/dovecot overwrites,
 557     # and might as well have this before reading /etc/mailpass,
 558     # which this sets up too.
 559     conflink
 560
 561     # begin setup passwd.client
 562     f=/etc/exim4/passwd.client
 563     s rm -f $f
 564     s touch $f
 565     s chmod 640 $f
 566     s chown root:Debian-exim $f
 567     # note: this will go away
 568     s cat /etc/mailpass| while read -r domain port pass; do
 569         # reference: exim4_passwd_client(5)
 570         printf "%s:%s\n" "$domain" "$pass" | s tee -a $f >/dev/null
 571     done
 572     # end setup passwd.client
 573
 574     # https://blog.dhampir.no/content/make-exim4-on-debian-respect-forward-and-etcaliases-when-using-a-smarthost
 575     # i only need .forwards, so just doing that one.
 576     cd /etc/exim4/conf.d/router
 577     a=userforward
 578     b=${a}_higher_priority
 579     tmp=$(mktemp)
 580     of=175_$b
 581     # sed to make the router name unique
 582     sed -r s/^\\S+:/$b:/ 600_exim4-config_$a | s dd of=$tmp 2>/dev/null
 583     if ! diff -q $tmp $of &>/dev/null; then
 584         s dd if=$tmp of=$of >/dev/null
 585     fi
 586
 587
 588     ser restart exim4
 589
 590 fi
 591
 592
 593
 594
 595
 596 # based on http://www.postfix.org/qmgr.8.html and my notes in gnus
 597 dir=/nocow/$type
 598 sdir=/var/spool/$type
 599 if [[ $(readlink -f $sdir) != $dir ]]; then
 600     ser stop $type
 601     if [[ ! -e $dir && -d $sdir ]]; then
 602         s mv $sdir $dir
 603     fi
 604     s lnf -T $dir $sdir
 605 fi
 606
 607 sgo $type
 608
 609
 610 # if I wanted the from address to be renamed and sent to a different address,
 611 # echo "sdx@localhost development@localhost" | sudo dd of=/etc/postfix/recipient_canonical
 612 # sudo postmap hash:/etc/postfix/recipient_canonical
 613 # sudo service postfix reload